DeltaPriceRound.php

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<?php
declare(strict_types=1);

namespace Magento\SalesRule\Model;

use Magento\Framework\Pricing\PriceCurrencyInterface;

class DeltaPriceRound
{
    private $priceCurrency;

    private $roundingDeltas;

    public function __construct(PriceCurrencyInterface $priceCurrency)
    {
        $this->priceCurrency = $priceCurrency;
    }

    public function round(float $price, string $type): float
    {
        if ($price) {
            // initialize the delta to a small number to avoid non-deterministic behavior with rounding of 0.5
            $delta = isset($this->roundingDeltas[$type]) ? $this->roundingDeltas[$type] : 0.000001;
            $price += $delta;
            $roundPrice = $this->priceCurrency->round($price);
            $this->roundingDeltas[$type] = $price - $roundPrice;
            $price = $roundPrice;
        }

        return $price;
    }

    public function resetAll(): void
    {
        $this->roundingDeltas = [];
    }

    public function reset(string $type): void
    {
        if (isset($this->roundingDeltas[$type])) {
            unset($this->roundingDeltas[$type]);
        }
    }
}